Norfolk's Seismic Design Category, explained

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Norfolk in Seismic Design Category A: Lowest seismic design category. Building code requires no seismic-specific detailing here beyond ordinary construction practice. Rank it against the rest of the country and Norfolk sits at the 14th percentile for seismic hazard among 4,875 US cities.

How Norfolk compares

USGS's underlying values for Norfolk: 0.042g peak ground acceleration, 0.087g at short period, 0.04g at 1 second. Within Virginia alone, Norfolk ranks 61 of 63 cities by seismic hazard - the 3th percentile in-state. Norfolk has a population of about 231,105.

What a retrofit costs in Norfolk

A full earthquake retrofit typically runs $5,000-$10,000 nationally (around $7,000 typical), driven mainly by house size and foundation type, not by Virginia specifically. California's Earthquake Brace + Bolt grant, which covers a large share of this cost, is a California-only program and does not apply in Virginia.

Insuring against this, not just retrofitting

A Norfolk homeowner cannot buy a standalone earthquake policy in most cases - it is added to an existing homeowners policy as an endorsement, so the place to start is a regular home-insurance quote.

Where Norfolk's figures come from

Norfolk's Category A and every number above trace to USGS's own ASCE 7-16 Design Maps service - see the methodology guide. See the category explainer for what Category A does and doesn't tell you about Norfolk.